[Webkit-unassigned] [Bug 124843] New: [CSS Regions] region-break-before and region-break-after are not equivalent in terms of break handling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=124843

           Summary: [CSS Regions] region-break-before and
                    region-break-after are not equivalent in terms of
                    break handling
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mibalan at adobe.com
                CC: WebkitBugTracker at adobe.com
            Blocks: 57312


Created an attachment (id=217808)
 --> (https://bugs.webkit.org/attachment.cgi?id=217808&action=review)
Test-case

Setting -webkit-region-break-after on an element triggers a different margin handling around the break point than setting -webkit-region-break-before on the next sibling of the element. Namely, -webkit-region-break-before leads to the before margin of the element it is applied to being incorrectly discarded.

In the attached file, all lorem ipsum paragraphs should have a yellow margins (actually the background of the region they flow into). When using region-break-before, the top margin is discarded (second heading, second paragraph)

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